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mtd: ubi: populate ubi volume fwnode

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Look for the 'volumes' subnode of an MTD partition attached to a UBI
device and attach matching child nodes to UBI volumes.
This allows UBI volumes to be referenced in device tree, e.g. for use
as NVMEM providers.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Daniel Golle 2023-12-19 02:33:38 +00:00 committed by Richard Weinberger
parent 7e84c961b2
commit 51932f9fc4
1 changed files with 27 additions and 0 deletions
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27
drivers/mtd/ubi/vmt.c
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@ -124,6 +124,31 @@ static void vol_release(struct device *dev)
kfree(vol);
}
static struct fwnode_handle *find_volume_fwnode(struct ubi_volume *vol)
{
struct fwnode_handle *fw_vols, *fw_vol;
const char *volname;
u32 volid;
fw_vols = device_get_named_child_node(vol->dev.parent->parent, "volumes");
if (!fw_vols)
return NULL;
fwnode_for_each_child_node(fw_vols, fw_vol) {
if (!fwnode_property_read_string(fw_vol, "volname", &volname) &&
strncmp(volname, vol->name, vol->name_len))
continue;
if (!fwnode_property_read_u32(fw_vol, "volid", &volid) &&
vol->vol_id != volid)
continue;
return fw_vol;
}
return NULL;
}
/**
* ubi_create_volume - create volume.
* @ubi: UBI device description object
@ -223,6 +248,7 @@ int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req)
vol->name_len = req->name_len;
memcpy(vol->name, req->name, vol->name_len);
vol->ubi = ubi;
device_set_node(&vol->dev, find_volume_fwnode(vol));
/*
* Finish all pending erases because there may be some LEBs belonging
@ -614,6 +640,7 @@ int ubi_add_volume(struct ubi_device *ubi, struct ubi_volume *vol)
vol->dev.class = &ubi_class;
vol->dev.groups = volume_dev_groups;
dev_set_name(&vol->dev, "%s_%d", ubi->ubi_name, vol->vol_id);
device_set_node(&vol->dev, find_volume_fwnode(vol));
err = device_register(&vol->dev);
if (err) {
cdev_del(&vol->cdev);